Lathe.



H. ARUNDEL & J. HIG'GINSON.

LATHE.

APPLlCATlON FILED NOV. I8. 1916.

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LATHE.

APRL'ICATION FILED NOV. 18. I916.

Patented Mar. 19, 1918.

6 SHEETS SHEET 3.

uzzde Patented Mar. 19, 1918.

6 SHEETS-SHEET 4- H. ARUNDEL 8L1. HIGGlNSON.

LATHE.

APPLlCATlQN ElLED NOV. 1a. 1916.

H. ARUNDEL & H|GGiNS0N'-- LATHE.

APPLLCATIQN FILED NOV. 18. 1916.

Patented Mar. 19, 1918;

6 SHEETS-SHEET 5- Invent vows:

H. ARUNDEL & J. HiGGlNSON.

LATHE.

APPLICATION FILED NOV. 18. I916.

Patnted Mar. 19, 1918.

6 SHEETS-SHEET 6.

0% A? TOR and Josnrn HmeINsoN, subjects of the said chain being TINT sHUBERT ARUNDEL AND JOSEPH HIGGINSON, 0F STOCKFORT, ENGLAND.

LATHE.

Specification of Letters Patent.

Patented Mar. 19, 1918.

Application filed November 18, 1916. Serial No. 132,185.

To all whom it may concern:

Be it known that we, HUBERT ARUNDEL King of Great Britain and Ireland,and residents of Sovereign Works, Stockport, in the county of Chester,England, have invented certain new and useful Improvements Relating toLathes, of which the following is a specification.

This invention has for its object to provide improved backing-off orrelieving means for lathes for the rapid, economical and efficientproduction of milling cutters.

' Referring to the accompanying sheets of explanatory drawings Figure 1is a front elevation and Fig. 2 a plan view of a relieving latheconstructed in one convenient form in accordance with our invention.

Figs. 3, 4 and 5 are detail views to be hereinafter referred to.

Figs. 6 and 7 are respectively plan and end elevation of means forsupporting the overhanging end of the cutting tool.

Fig. 8 is a front view of a modified arrangement of the cutter head,with the indexing arrangement removed for the sake of clearness.

Fig. 9 is a plan view of the parts shown in Fig. 8, but with theindexing arrangement in place.

Fig. 10 is a detailed diagram showing the arrangement of the gearing fordriving the work mandrel.

The same reference letters in the different views indicate the same orsimilar parts.

The slide acarrying the cutting tool I) is adapted to be traversedacross the lathe bed 0 for backing off or relieving purposes by a screwand nut device in operative connection with the work carrying mandreldin order to obtain the necessary unison of movements. The cutter beingproduced is shown at c, Fig. 2. Such operative connection may beobtained by suitable gearing (giving the required number of backing-ofitraverses to the cutting tool slide for a complete turn of the cutterbeing actuated through a clutch.

The means for traversing the cutter head from the work mandrel drivinggear are as follows The belt pulley f (Figs. 1, 2 and 10) by means ofspur wheels g, h, shaft 2' and spur wheels j, 7*: rotates a spiral gearm on a spindle n in a movable gear box 0, the latter produced) and achain, the

being pivotally supported in the known manner about the spindle 2' sothat it can fall to put the spiral gear on out of engagement with aspiral gear p. On the shaft 10 carrying the spiral gear 10 there is aspur pinion 9 (indicated by dotted lines in Fig. 10; see also Fig. 3)meshing with an intermediate spur wheel r in gear with a wheel 8 on aspindle 2. carrying the disk it having a pawl 12 thereon (see Fig. 3).The spindle p car rying the spiral gear wheel 79 and spur pinion g formsthe driving spindle of the work mandrel d through the worm w and wormwheel m (see Figs. 2 and 10). Thus the rates of rotation of the disk uand of the work mandrel are definitely proportioned in accordance withthe size of the spur wheels 9 and s.

The pawl 12 on the disk u is adapted to engage a notch or single toothin a wheel or collar y forming part of a chain block 2 (see Fig. 3) towhich one end of a chain 2 is secured. The other end of said chain issecured to a chain block 3 (see Fig. d) which is keyed upon a nut-likepart a working in conjunction with a screw 5. The latter has a portion 6threaded with a thread of opposite hand to the thread at 5 and passingthrough a nut portion 7 upon the cutter head a. The other end of thescrewed rod 5, 6 has a hand wheel 8 thereon and an indexed wheel 9 forsetting purposes. A locking pin 10 is for preventiing rotation of thehand wheel 8 and index. A weight 11 (see Fig. 1) working in a dashpot 12is attached by a chain or the like 13 to the block 14 so as to returnthe said block and the nut 4 to its initial position when the chain 2slackens back as hereinafter described. The nut a is prevented fromhaving any endwise movement by a bearing 15 supported in any suitablemanner, not shown in Fig. l.

The pawl '0 is put out of action once during each revolution of the diskin by the stop 16 (see Fig. 3) which engages the outer end 17 of thepawl.

With the arrangement aforesaid, the disk a during one revolution windsthe chain 2 on to the block 2 and unwinds it from the block 3. The nut 4is thus rotated and so pawl, the weight 11 returns the cutter head toits initial position. On the continued rotation of the disk a, the pawlo again engages the disk y and the cycle of operations is then repeated.

A weight 18 (see Fig. 1) may act directly upon the cutter head a toassist in the re- 7 turn of the latter to its starting positionrangement shown in Fig. at for setting the cutter head, we may employ anintermediate slide 20 (see Figs. 8 and 9) which has a definite fixedback and forth movement imparted thereto by the chain and screw and nutdevice as before described, while adjustment of the cutter head iseffected by moving same upon the intermediate slide by a screw and nutdevice under the control of the hand wheel 8.

When working upon milling cutters of any considerable axial length, wemay pro vide a pressure plate 21 (see Figs. 6 and 7-) to act as a steadyfor the outer end of the cutting tool. Chatter of said tool is thusprevented. i

By the employment of the improved construction before described, weobtain a very even motion of the cutter slide and obviate backlash inthe actuating mechanism between the Work mandrel and slide, resulting inhigh efficiency with rapidity of produc tion. i

We may vary the details of our improved mechanism to meet any particularrequire ments. The machine is particularly adapted for the production ofthread milling cuttors in an expeditious and economical manner.

Having now described our invention, what we claim as new, and desire tosecure by Letters Patent is:

1. In relieving or backing-off lathes, in combination, a headstock, awork carrying mandrel supported in said headstock, means for rotatingsaid mandrel, a movable headstock, means for traversing said headstockaway from and toward the former head stock, a cross slide upon themovable headstock, a cutter carrying spindle upon said cross slide,means for rotating said cutter carrying spindle, a screw and nut devicefor cross traversing said cross slide, and means in operative connectionwith the means for rotating the work carrying spindle for actuating saidscrew and nut device, as set forth.

2. In relieving or backing-01f lathes, in

combination, a fixed headstock, a work 'arrying mandrel supported insaid headstock, means for rotating said mandrel, a movable headstock,means for traversing said headstock away from and toward the fixedheadstock, a cross slide upon said movable headstock, means for handadjusting.

said cross slide upon themovable headstock, a cutter carrying spindleupon the cross slide, means for rotating, the cutter carrying spindle, ascrew and nut device for cross traversing said cross slide, meansinoperative connection with the means for rotating the work carryingspindle for rotating the nut in one direction, and means for rotatingthe nut in a reverse direction, as set forth.

'3. In relieving or backing-off lathes, in combination, a fixedheadstock, a work carrying. mandrel supported in said headstock, meansfor rotating said mandrel, a movable headstock, means for traversingsaid. headstock awa from and toward the fixed headstock, a cross slideupon said movable headstock, means for hand adjusting said cross slideupon the movable headstock, a cutter carrying spindle upon the crossslide, means for rotating the cutter carryingspindle, a screw and nutdevice for cross traversing said cross slide, meansin. operativeconnection with the means for rotating the work carrying spindle forrotating the nut in one direction and a weight forrotating the nut inthe reverse direction, as set forth. I

4-. In relieving or backing-off lathes, in combination, a fixedheadstock, a work carrying mandrel supported in said headstock, meansfor rotating said mandrel, a movable headstock, means for raversing saidheadstock away from and toward the fixed headstock, a cross slide uponsaid movable head stock, means for hand adjusting said cross slide uponthe movable headstock, a cutter carrying spindle upon the cross slide,means for rotating the cutter carrying spindle, a screw and nut devicefor cross traversing said cross slide, means in operative connectionwith the means for rotating the work carrying spindle for rotating thenut in one direction, means for disengaging the aforesaid means rotatingthe nut, anda weight working in a dashpot for rotating it in its reversedirection, as set forth.

5. In relieving or backing-offlathes, in combination, a fixed headstock,a work carrying mandrel supported in said headstock,

means for rotating said mandrel, a movable headstock, means fortraversing said head.-'

stock, means for hand adjusting said. cross:

slide upon the movable headstock, a cutter carrying spindle upon thecross-slide, means for rotating the cutter carrying spindle, a.

screw and nut device for cross traversing said cross sllde, a dlsk,means n operative connection with the means for rotating the workcarrying mandrel for rotating said disk, a chain in operative connectionwith said disk at one end and with said nut at the other end, means fordisengaging said disk rotating means, and a'weight suspended from andraised and lowered by the rotation of said nut, as set forth.

6. In relieving or backing-off lathes, in combination, a fixedheadstock, a work carrying mandrel supported in said headstock, a wormand worm wheel for rotating said mandrel, a movable headstock, means fortraversing said headstock away from and toward said fixed headstock, across slide upon said movable headstock, a cutter carrying spindle uponthe cross slide, means for rotating said cutter carrying spindle, ascrew engaging a lug on said cross slide, hand wheel for rotating saidscrew at one end, means for locking said hand wheel and the screwagainst rotation, a nut upon the screw at the other end, means inoperative connection with the work carrying mandrel for rotating the nutin one direction, and automatic means for rotating the nut in a reversedirection, as set forth.

7. In relieving or backing-oft lathes, in combination, a fixedheadstock, a work carrying mandrel supported in said headstock, a wormand worm wheel for rotating said mandrel, a movable headstock, means fortraversing said headstock away from and toward said fixed headstock, across slide upon said movable headstock, a cutter carrying spindle uponthe cross slide, means for rotating said cutter carrying spindle, ascrew engaging a lug on said cross slide, hand wheel for rotating saidscrew at one end, means for locking said hand wheel and the screwagainst rotation a nut capable of rotary but not longitudinal movementupon the screw at the other end, a disk, means in operative connectionwith the means for rotating the work carrying mandrel for rotating saiddisk, a chain in operative connection with said disk and also with saidnut, means for disengaging said disk rotating means, and a weight alsoin operative connection with said nut, as set forth.

8. In relieving or backing-ofi' lathes, in combination, a fixedheadstock, a work carrying mandrel supported in said headstock, a wormand Worm wheel for rotating said mandrel, a movable headstock, means fortraversing said movable headstock away from and toward said fixedheadstock, a cross slide upon said movable headstock, a weight attachedto and raised and lowered by the movements of said cross slide, a cuttercarrying spindle upon the cross slide, means for rotating the cuttercarrying spindle, a screw engaging a lug on said cross slide, hand wheelfor rotating said screw at one end, means for looking said hand wheelmeans and the screw against rotation, a nut capable of rotary but notlongitudinal move ment upon the screw at the other end, a weightsuspended from and raised and lowered by the rotation of said nut, adash pot for said weight, a disk, a one-tooth clutch in operativeconnection with the mandrel rotating means for rotating said disk, meansfor disengaging said clutch, and a chain in operative connection withsaid disk and said nut, as set forth.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

HUBERT ARUN DEL. JOSEPH HIGGINSON. Witnesses HILDA Hnenns, ARTHURHUGHES.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

